
#include "atomic_op_asm.h"

#ifdef _ARM_ARCH_6

ENTRY_NP(_atomic_sub_8)
	negs	r1, r1
	/* FALLTHROUGH */
ENTRY_NP(_atomic_add_8)
	mov	ip, r0
1:	ldrexb	r0, [ip]		/* load old value */
	adds	r3, r0, r1		/* calculate new value */
	strexb	r2, r3, [ip]		/* try to store */
	cmp	r2, #0			/*   succeed? */
	bne	1b			/*     no, try again */
#ifdef _ARM_ARCH_7
	dmb
#else
	mcr	p15, 0, r2, c7, c10, 5	/* data memory barrier */
#endif
	RET				/* return old value */
END(_atomic_add_8)
END(_atomic_sub_8)

ATOMIC_OP_ALIAS(atomic_add_8,_atomic_add_8)
ATOMIC_OP_ALIAS(atomic_add_char,_atomic_add_8)
ATOMIC_OP_ALIAS(atomic_add_uchar,_atomic_add_8)
CRT_ALIAS(__sync_fetch_and_add_1,_atomic_add_8)
CRT_ALIAS(__atomic_fetch_add_1,_atomic_add_8)
STRONG_ALIAS(_atomic_add_char,_atomic_add_8)
STRONG_ALIAS(_atomic_add_uchar,_atomic_add_8)

ATOMIC_OP_ALIAS(atomic_sub_8,_atomic_sub_8)
ATOMIC_OP_ALIAS(atomic_sub_char,_atomic_sub_8)
ATOMIC_OP_ALIAS(atomic_sub_uchar,_atomic_sub_8)
CRT_ALIAS(__sync_fetch_and_sub_1,_atomic_sub_8)
CRT_ALIAS(__atomic_fetch_sub_1,_atomic_sub_8)
STRONG_ALIAS(_atomic_sub_char,_atomic_sub_8)
STRONG_ALIAS(_atomic_sub_uchar,_atomic_sub_8)

ENTRY_NP(_atomic_sub_8_nv)
	negs	r1, r1
	/* FALLTHROUGH */
ENTRY_NP(_atomic_add_8_nv)
	mov	ip, r0			/* need r0 for return value */
1:	ldrexb	r0, [ip]		/* load old value */
	adds	r0, r0, r1		/* calculate new value (return value) */
	strexb	r2, r0, [ip]		/* try to store */
	cmp	r2, #0			/*   succeed? */
	bne	1b			/*     no, try again? */
#ifdef _ARM_ARCH_7
	dmb
#else
	mcr	p15, 0, r2, c7, c10, 5	/* data memory barrier */
#endif
	RET				/* return new value */
END(_atomic_add_8_nv)
END(_atomic_sub_8_nv)
ATOMIC_OP_ALIAS(atomic_add_8_nv,_atomic_add_8_nv)
ATOMIC_OP_ALIAS(atomic_add_char_nv,_atomic_add_8_nv)
ATOMIC_OP_ALIAS(atomic_add_uchar_nv,_atomic_add_8_nv)
CRT_ALIAS(__sync_add_and_fetch_1,_atomic_add_8_nv)
STRONG_ALIAS(_atomic_add_char_nv,_atomic_add_8_nv)
STRONG_ALIAS(_atomic_add_uchar_nv,_atomic_add_8_nv)

ATOMIC_OP_ALIAS(atomic_sub_8_nv,_atomic_sub_8_nv)
ATOMIC_OP_ALIAS(atomic_sub_char_nv,_atomic_sub_8_nv)
ATOMIC_OP_ALIAS(atomic_sub_uchar_nv,_atomic_sub_8_nv)
CRT_ALIAS(__sync_sub_and_fetch_1,_atomic_sub_8_nv)
STRONG_ALIAS(_atomic_sub_char_nv,_atomic_sub_8_nv)
STRONG_ALIAS(_atomic_sub_uchar_nv,_atomic_sub_8_nv)
#endif /* _ARM_ARCH_6 */
